Shuttle for sewing-machines.



P. SJ'OSTROM.

SHUTTLE FOR SEWING MACHINES.

APPLICATION FILED DEC- 13, 1915.

1,218,220. r Patentd Ma1l'.6,l917.

Inventor: leter *ijosbr'om,

v b w yg m: m-nms Pzrsns cm. PMOHILITNOH wAsnmaruN. u c.

. slA'rs PETER, SJOSTROM, OF MAPLEWOOID, MASSACHUSETTS, ASSIGNOR T0VICTOR SHOE MACHINERY COMPANY, OF LYNN, MASSACHUSETTS, A CORPORATION OFMASSA- OI-IUSETTS.

SHUTTLE FOR SEWING-MACHINES.

Application filed December 13, 1915.

To all whom it may concern:

Be it known that I, PETER SJosTRoM, a subject of the King of Sweden, anda resident of Maplewood, in the county of Middlesex and State ofMassachusetts, have invented certain new and useful Improvements inShuttles for Sewing-Machines, of which the following is a specification.

This invention relates to shuttlesfor machines for sewing heavy materialsuch as leather, and particularly to that type of such machines known aswelt sewing machines.

One object of the invention is the provision of means whereby the threadmay be drawn fro-m the periphery of the bobbin.

33 on Fig. 1 and drawn to an enlarged scale.

Similar characters designate like parts throughout the several figuresof the draw- 1ngs.

In the drawings, 10 is a shuttle case provided with the usual hook 11having a peripheral depression 12 in advance thereof. The case 10 isprovided with a bobbin recess 13 extending inwardly from one facethereof, said recess being eccentrically disposed relatively to the axisof rotation of the shuttle.

Centrally positioned in the recess 13 is a support 14 extending into thecentral bore 15 of the bobbin 16 carrying the coil of thread 17. Thesupport 14 is diametrically opposed to the point of the hook 11. Theinner flange 18 of the bobbin 16 flares inwardly as shown in Fig. 3,thereby forming an annular space 19 between said flange and the bottomof said recess, from which there. is an outlet for the thread throughthe opening 20 in the center of the case 10.

The case 10 is also provided with two Specification of Letters Patent.

Patented Man 6, 1917.

Serial No. 67,059.

holes 21 and 22 extending from the recess 13 to the depression 12, theouter ends of these holes being connected by a groove 23 in which thethread 17 is adapted to extend as it passes from the hole 21 to the hole22, thus avoiding any interference with the usual shuttle-rotating-lugpositioned in said recess.

The hole 21 communicates with the recess 13 at a point between theflanges of the bobbin 16 and the hole 22 is opposite the space 19.

The thread 17 passes'outwardly through the hole 21 along the groove 23to the hole 22 through which it passes to the space 19 and then throughthe central outlet 20 in the center of the case 10.

The bobbin support 14 has a diametral slot 24 in its outer end in whichis pivoted at 25 a locking member 26 provided with an inwardlyprojecting cam portion 27 at one side of the pivot 25 and a projectingfinger 28 at the other side of said pivot.

The finger 28 bears on the outer face of the bobbin and normally retainsit on its support 14. This support 14 is provided with a cylindricalchamber having a disk 29 at its inner end and at its outer end a movableplunger 30 forced outwardly against the cam portion 27 by a spring 31interposed between said plunger and disk.

The outward pressure of the spring 31 forces the finger 28 into suchfrictional contact with the face of the bobbin as to prevent'any rapidrotation of the said bobbin. In other words the bobbin is restrainedfrom rotation except as the thread 17 is pulled from the coil.

The pressure of the spring may be regulated by the member 32 threaded inthe base of the support 14. By providing the delivery of the thread fromthe coil of thread drawn into the groove 23. When once drawn into thegroove 23 it will be retained in this groove by the friction finger 28which will permit the bobbin 16 to rotate only as fast as the thread istautly drawn therefrom.

When it is desired to-remove the bobbin 16 the finger 28 may be moved inthe direction of the arrow a until it is parallel with the axis of thesupport 14.

It will be observed that only the hub of the bobbin 16 bears against thebottom of the recess 13, and therefore the friction between the bobbin16 and case 10 is reduced to a minimum.

It is believed that the operation and many advantages of this inventionwill be fully understood from the foregoing description.

Having thus described my invention, 1 claim:

1. In a device of the class described, the combination of a shuttle caseprovided with a loop engaging hook and having a peripheral depressionadapted to receive a projection from a shuttle carrier, an eccentricallydisposed bobbin recess in one face, two radial thread passages betweensaid recess and depression, and a central discharge passage from thebottom of said recess; and y a thread carrying bobbin having its hubextending beyond the inner flange thereof and adapted to contact withthe bottom wall of said recess.

2. In a device of the class described, the

combination of a shuttle case provided with a loop engaging hook andhaving an eccentrically disposed bobbin recess in one face thereof, aperipheral depression adapted to receive a projection from a shuttlecarrier, and a centrally disposed thread discharge outlet extendingthrough said case from the bottom of said recess; a bobbin supportcentrally disposed in said recess and cal wall of the shuttle case tosaid peripheral depression and then returned through said case to thebobbin recess at a point between the bottom of said recess and the innerflange of the bobbin and finally delivered from said recess through thedischarge outlet.

Signed by me at Boston, Mass, this 1+Lth day of October, 1915.

PETER SJOSTROM.

Witnesses:

WALTER E. LOMBARD, v NATHAN C. LOMBARD.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents Washington, D. G.

